Java 无法使用 javax.imageio 或 Sanselan 读取图像

Question

I want to read an image to scale it using awt and Apache Commons Imaging, previously known as Apache Commons Sanselan I can not scale the image but I can see it in the browser properly as jpg without any problem. Getting the image info using

Sanselan.getMetadata(fileData)

I get this info:

No Exif metadata.
Photoshop (IPTC) metadata:

The code

public static byte[] scale(byte[] fileData, int width, int height) {

        ByteArrayInputStream in = new ByteArrayInputStream(fileData);

        try {

            BufferedImage img = javax.imageio.ImageIO.read(in);

            ....

            return buffer.toByteArray();

        } catch (IOException e1) {

            System.out.println  ("e1 -> " + e1.getMessage());

            try {

                BufferedImage img = Sanselan.getBufferedImage(in);

            } catch (ImageReadException | IOException e2) {

                System.out.println  ("e2 -> " + e2.getMessage());
            }

        }

        return fileData;
    }

but I got this exceptions:

e1 -> Unsupported Image Type
e2 -> Can't parse this format.

Answer 1

Image scaling can be done without external libraries.

Image img = ImageIO.read(URL);
Image scaledImg = img.getScaledInstance(IMG_WIDTH, IMG_HEIGHT, Image.SCALE_DEFAULT);

See the docs for further inspiration.